scyther/src/claims.c

227 lines
4.9 KiB
C

#include <stdlib.h>
#include "termmaps.h"
#include "runs.h"
#include "error.h"
#define MATCH_NONE 0
#define MATCH_ORDER 1
#define MATCH_REVERSE 2
#define LABEL_GOOD -3
#define LABEL_TODO -2
/*
* Validity checks for claims
*/
//! Check complete message match
/**
*@returns any of the MATCH_ signals
*/
int
events_match (const System sys, const int i, const int j)
{
Roledef rdi, rdj;
rdi = sys->traceEvent[i];
rdj = sys->traceEvent[j];
if (isTermEqual (rdi->message, rdj->message) &&
isTermEqual (rdi->from, rdj->from) &&
isTermEqual (rdi->to, rdj->to) &&
isTermEqual (rdi->label, rdj->label) &&
!(rdi->internal || rdj->internal))
{
if (rdi->type == SEND && rdj->type == READ)
{
if (i<j)
return MATCH_ORDER;
else
return MATCH_REVERSE;
}
if (rdi->type == READ && rdj->type == SEND)
{
if (i>j)
return MATCH_ORDER;
else
return MATCH_REVERSE;
}
}
return MATCH_NONE;
}
//! nisynch generalization
/**
* f maps the involved roles to run identifiers.
* g maps all labels in prec to the event indices for things already found,
* or to LABEL_TODO for things not found yet but in prec, and LABEL_GOOD for well linked messages (and that have thus defined a runid for the corresponding role).
* All values not in prec map to -1.
*@returns 1 iff the claim is allright, 0 iff it is violated.
*/
int
oki_nisynch (const System sys, const int i, const Termmap f, const Termmap g)
{
// Check for completed trace
if (i == -1)
{
// Are all labels well linked?
Termmap gscan;
gscan = g;
while (gscan != NULL)
{
if (gscan->result != LABEL_GOOD)
return 0;
gscan = gscan->next;
}
return 1;
}
else
{
Roledef rd;
int rid;
rd = sys->traceEvent[i];
rid = sys->traceRun[i];
/*
* Simple case: internal event or claim
*/
if (rd->type == CLAIM || rd->internal)
{
return oki_nisynch (sys,i-1,f,g);
}
else
{
/*
* More difficult cases: send and read
*/
if (rd->type == READ)
{
/*
* Read is only relevant for already involved runs, and labels in prec
*/
Termmap fscan;
fscan = f;
while (fscan != NULL)
{
if (fscan->result == rid)
{
// Involved, but is it a prec label?
if (termmapGet (g, rd->label) == LABEL_TODO)
{
Termmap gbuf;
int result;
gbuf = termmapDuplicate (g);
gbuf = termmapSet (gbuf, rd->label, i);
result = oki_nisynch (sys,i-1,f,gbuf);
termmapDelete (gbuf);
return result;
}
}
fscan = fscan->next;
}
// Apparently not involved
return oki_nisynch (sys,i-1,f,g);
}
if (rd->type == SEND)
{
// Scan whether we were waiting for it or not
int result;
int rid2;
Term rolename;
Termmap gscan;
/*
* Two options: it is either involved or not
*/
// 1. Assume that this run is not yet involved
result = oki_nisynch (sys, i-1, f, g);
// 2. It is involved. Then either already used for this role, or will be now.
rolename = sys->runs[rid].role->nameterm;
rid2 = termmapGet (f, rolename);
if (rid2 == -1 || rid2 == rid)
{
// Was not involved yet in a registerd way, or was the correct rid
gscan = g;
while (!result && gscan != NULL)
{
// Ordered match needed
if (gscan->result > -1 &&
events_match (sys, gscan->result, i) == 1)
{
Termmap fbuf, gbuf;
/**
*@todo Optimization can be done when rid2 == rid, no copy of f needs to be made.
*/
fbuf = termmapDuplicate (f);
fbuf = termmapSet (fbuf, rolename, rid);
gbuf = termmapDuplicate (g);
gbuf = termmapSet (gbuf, rd->label, -3);
result = oki_nisynch (sys, i-1, fbuf, gbuf) || result;
termmapDelete (gbuf);
termmapDelete (fbuf);
}
gscan = gscan->next;
}
}
return result;
}
/*
* Exception: no send, no read, what is it?
*/
error ("Unrecognized event type in claim scanner at %i.", i);
}
}
}
/*
* Real checks
*/
//! Check validity of ni-synch claim at event i.
/**
*@returns 1 iff claim is true.
*/
int
check_claim_nisynch (const System sys, const int i)
{
Roledef rd;
int result;
int rid;
Termmap f,g;
Term label;
Claimlist cl;
Termlist tl;
rid = sys->traceRun[i];
rd = sys->traceEvent[i];
cl = rd->claiminfo;
cl->count++;
f = termmapSet (NULL, sys->runs[rid].role->nameterm, rid);
// map all labels in prec to LABEL_TODO
g = NULL;
label = rd->label;
tl = cl->prec;
while (tl != NULL)
{
g = termmapSet (g, tl->term, LABEL_TODO);
tl = tl->next;
}
/*
* Check claim
*/
result = oki_nisynch(sys, i, f, g);
if (!result)
{
cl->failed++;
}
termmapDelete (f);
termmapDelete (g);
return result;
}